package com.changzhi.util;

import com.alibaba.fastjson.JSONObject;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class WxUtil {

    //当前页面，此处我是直接使用域名来访问当前需要分享的页面
    public static final String url = "www.xxx.top";

    /**
     * 通过appId和appSecret 获取Token
     *
     * @param appId
     * @param appSecret
     * @return
     */
    public static String getAccessToken(String appId, String appSecret) {

        String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId + "&secret=" + appSecret;
        String accessToken = null;
        try {
            URL urlGet = new URL(url);
            HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();
            http.setRequestMethod("GET"); // 必须是get方式请求
            http.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            http.setDoOutput(true);
            http.setDoInput(true);
            System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
            System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
            http.connect();
            InputStream is = http.getInputStream();
            int size = is.available();
            byte[] jsonBytes = new byte[size];
            is.read(jsonBytes);
            String message = new String(jsonBytes, "UTF-8");
            JSONObject jsonObj = JSONObject.parseObject(message);
            accessToken = jsonObj.getString("access_token");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return accessToken;
    }

    /**
     * 获得ACCESS_TICKET
     *
     * @param access_token
     * @return
     */
    public static String getAccessTicket(String access_token) {
        String ticket = null;
        String url =
                "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="
                        + access_token + "&type=jsapi";//这个url链接和参数不能变
        try {
            URL urlGet = new URL(url);
            HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();
            http.setRequestMethod("GET"); // 必须是get方式请求
            http.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            http.setDoOutput(true);
            http.setDoInput(true);
            System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
            System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
            http.connect();
            InputStream is = http.getInputStream();
            int size = is.available();
            byte[] jsonBytes = new byte[size];
            is.read(jsonBytes);
            String message = new String(jsonBytes, "UTF-8");
            JSONObject demoJson = JSONObject.parseObject(message);
            System.out.println("JSON字符串：" + demoJson);
            ticket = demoJson.getString("ticket");
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ticket;
    }

    /**
     * 加密
     *
     * @param decript
     * @return
     */
    public static String SHA1(String decript) {
        try {
            MessageDigest digest = java.security.MessageDigest.getInstance("SHA-1");
            digest.update(decript.getBytes());
            byte messageDigest[] = digest.digest();
            // Create Hex String
            StringBuffer hexString = new StringBuffer();
            // 字节数组转换为 十六进制 数
            for (int i = 0; i < messageDigest.length; i++) {
                String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                if (shaHex.length() < 2) {
                    hexString.append(0);
                }
                hexString.append(shaHex);
            }
            return hexString.toString();

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }

}